Dynamo-electric machine.



No. 635,489. Patantad Oct. 24, 1899.

N. J. LASCHET. DYNAIIO ELECTRIC MACHINE.

(Application filed July 3, 1899.\

(No Model.)

5 1g 7 Z m a a h S M UNITED STATES PATENT Erica.

NICOLAS JOSEPH LASCHET, OF DARMSTADT, GERMANY, ASSIGNOR TO THE SIEMENS & IIALSKE ELECTRIC COMPANY OF AMERICA, OF CHICAGO,

ILLINOIS.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 635,489, dated October 24, 1899.

Application filed July 3, 1899. Serial No. 722,754. (No model.)

To aZZ whom it may concern:

Be it known that I, NICOLAS JOSEPH LAS- CHET, residing at Darmstadt, Empire of Germany, have invented a certain new and useful 5 Improvement in Dynamo-Electric Machines, (Case No. 219,) of which the following is a full, clear, concise, and exact description, ref erence being had to the accompanying drawings, forming a part of this specification.

1 My invention relates to dynamo-electric machines, aud has for its object the provision of improved means for adjusting the air-gap between the armature and fields of such machines. The invention is of particular utility [5 in connection with alternating-current motors of the single-phase or multiphase type, between whose fields and armatures very small air-gaps are very essential. It has heretofore been difficult to effect this adjustment by changing the position of the shafts. By means of my invention the opposed faces of the armature and field may readily be made concentric, so that the air-gap may be of the proper radial width throughout.

2 5 My invention comprises improved means for adjusting the field or stator portion of the machine. I preferably provide an annular casing and support the field or non-rotatable member within the said casing and provide threaded rods between the said casing and the said member for the purpose of effecting the required adjustment.

1 will explain my invention more fully by reference to the accompanying drawings, in

3 5 which- I Figure 1 is a transverse sectional view of a multiphase-current motor employing the adjusting mechanism of my invention. Fig. 2 is a longitudinal sectional view on line 2 2 of Fig. 1.

Like parts are indicated by similar letters of reference in both views.

The rotatable member or rotor a has its shaft 1) mounted to rotate in suitable bearings 4.5 c 0. These bearings are preferably attached directly to the casing d, forming the support for the entire apparatus. The field-core 6 constitutes the core of the field-windings of a multiphase machine. Interposed between the outer periphery of the field-core and the peripheral portion of the surrounding casin g are provided a plurality of adjusting devices f, which are preferably in the form of threaded rods extending radially from the shaft Z), each engaging the outer periphery of the field-core at one end and having threaded engagement at the opposite end with threaded bores pr0- vided in enlargements of the casing. To secure the proper axial disposition of the fieldcore, I preferably form each adjustingdevice of a number (preferably two) of adjustingrods j, which are interposed between the casing of the field-core, near the radial or end faces of the latter. I have shown three adjusting devices one hundred and twenty degrees apart for effecting the desired adjustment, although the number of adjusting devices may be varied and their relative dispositions may be changed without departing from the spirit of the invention.

The operation of the adjusting devices is apparent, since by properly turning the rodsf the field-core may be moved in its plane until the desired adjustment of the air-gap between the same and the rotor is secured.

Where machines of larger size are to be equipped with the device of my invention, I preferably employ as a further part of each adjusting device a block g, these blocks being recessed for engaging the stator to prevent the end thrust thereof, as shown most clearly in Fig. 2, the end portions of the said blocks extending centrally and engaging the radial or end faces of the stator.

While I have herein shown and particularly 8 described the preferred embodiment of my invention and a particular,application thereof, I do not wish to be limited to the precise construction shown; but,

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a dynamo-electric machine, the combination with the rotatable and non-rotatable members thereof, of an inclosure for the said 5 members, and adjusting means movable substantially radially interposed between the said inclosure and the non rotatable member, whereby the accurate adj ustment of the airgap between the said members may be readily effected, substantially as described.

2. In a dynamo-electric machine, the com- IOO bination wit-h the rotatable and non-rotatable members thereof, of an inclosure for the said members, and a plurality of independentlyacting adjusting devices acting substantially radial]y,distributed around the non-rotatable member and interposed between theinclosure and the non-rotatable member to effect the adjustment of the air-gap between the said members, substantially as described.

3. In a dynamo-electric machine, the combination with the rotatable and non-rotatable members thereof, of a casin g inclosin g the said members, and threaded adjusting devices ff distributed around the casin g and interposed between the same and the non-rotatable me1nber to effect the adjustment of the air-gap between the said members, substantially as described.

at. In a dynamo-electric machine, the conibination with rotatable and non-rotatable members, of a casing inclosing the said members, a plurality of adjusting devices interposed between the said casing and the nonrotatable member for-effecting the adjustment of the air-gap, each adjusting device comprising two threaded rods, and a block g engaging the inner ends thereof and provided with a recess for engaging the outer periphery of the non-rotatable member to prevent end play thereof, substantially as described.

In witness whereof I hereunto subscribe my name this 15th day of June, A. I). 1899.

NIOOLAS JOSEPH LASOIIET. Witnesses:

RICHARD GUENTHER, J EAN GRUND. 

